Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (6): 1887-1896.doi: 10.13278/j.cnki.jjuese.20190167

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Anisotropy Forward Modeling of Magnetotelluric(MT) Adaptive Finite Element

Feng Kai1, Qin Ce2   

  1. 1. Institute of Geophysical Instruments, Xi'an Research Insititute, China Coal Technology and Engineering Group, Xi'an 710077, China;
    2. Institute of Physics and Electronic Information, Henan University of Technology, Jiaozuo 454000, Henan, China
  • Received:2019-08-22 Online:2020-11-26 Published:2020-12-11
  • Supported by:
    Supported by Youth Program of National Natural Science Foundation of China (41904078)

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Abstract: Electrical anisotropy is ubiquitous in nature, especially in some sedimentary basins, where some rock layers underwent compaction and metamorphism,showing a strong anisotropic conductivity,on which a positive and negative interpretation is more reasonable and accurate. The forward calculation of magnetotelluric anisotropy by adaptive finite element method was used to simulate the response of horizontal, vertical and oblique anisotropic media at different deflection angles and spindle resistivity in this study. The results show that the adaptive finite element can obtain a reasonable mesh under the control of the posterior error, and make the calculation result closer to the analytical solution; In anisotropic media, the apparent resistivity and impedance phase of the magnetotelluric TE polarization mode is independent of the resistivity perpendicular to the plane; In a two-dimensional anisotropic structure, the magnetotelluric TM polarization mode response is always determined by the resistivity component on the spindle in the y-axis direction.

Key words: magnetotelluric, anisotropy, adaptive finite element method, electrical spindl

CLC Number: 

  • P631.3
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